Automatic motor control for fraction-collection apparatus



G. GORHAM 2,672,581

AUTOMATIC MOTOR CONTROL FOR FRACTION-COLLECTION APPARATUS March 16, 1954 Original Filed Sept. 5, 1947 8 Sheets-Sheet 1 FIG. l

O INVENTOR. GEORGE GORHAM BY o-1.. M m -2 March 16, 1954 GQRHAM 2,672,581

AUTOMATIC MOTOR CONTROL FOR FRACTION-COLLECTION APPARATUS Original Filed Sept. 5. 1947 8 Sheets-Sheet 2 FIG. 2

I \Mm l 312! 26 252 206 I74 |2 74 FIG. 5

go I 66 TKT /T \Q I8 t 64 2o W H 1 fizla. 62

I I8 ii INVENTOR. GEORGE GORP-[AM BY 5mm F March 16, 1954 GQRHAM 2,672,581

AUTOMATIC MOTOR CONTROL FOR FRACTION-COLLECTION APPARATUS Original Filed Sept. 5, 1947 8 Sheets-Sheet 3 82 Pl 5. 5 a

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GEORGE GORHAM G. GORHAM March 16, 1954 AUTOMATIC MOTOR CONTROL FOR FRACTION-COLLECTION APPARATUS Original Filed Sept. 5, 1947 8 Sheets-Sheet 4 March 16, 1954 G. GORHAM 2,672,581

AUTOMATIC MOTOR CONTROL FOR FRACTION-COLLECTION APPARATUS Original Filed Sept. 5, 1947 8 She'ets-Sheet 5 III - INVENTOR.

GEORGE GORHAM \52 ye. G F

I MSG;

March 16, 1954 GQRHAM 2,672,581

AUTOMATIC MOTOR CONTROL FOR FRACTION-COLLECTION APPARATUS Original Filed Sept. 5. 1947 8 Sheets-Sheet 6 I 224 264 244 i 218 I98 228 I JNVENTOR. GEORG lllllllllllll E G-ORHAM as BY labwbllmog 1 WV ///2 W c Q 532 244 24 232/ k 196 I 7a 230 A 'rozzfz'ya G. GORHAM March 16, 1954 AUTOMATIC MOTOR CONTROL FOR FRACTION-COLLECTION APPARATUS 8 Sheets-Sheet 7 Original Filed Sept. 5, 1947 INVENTOR. GEORGE GORHAM G. GORHAM Marc]; 16, 1954 AUTOMATIC MOTOR CONTROL FOR FRACTION-COLLECTION APPARATUS 8 Sheets-Sheet 8 Original Filed Sept. 5, 1947 INVENTOR. GEORGE GOFZHAM N n-H1 C(ri ATTO-ENFKS Patented Mar. 16, 1954 :AUIOMATIGMOTOR 'CONTROLTFOR FRAG- T-ION*COLLECTION APBARATUS George fiorham, New York, "N. Y., assignor to Technlcon Chromatography Corporation, New York, N. Y., a corporation of New York Original application September 5, .1947, .SeriaLNo.

772,389. Divided and this application March 29,1951, Serial No. 218,187

.19 Claims. 1 This invention relates to an automatic fractioncollection apparatus.

The primary object of the present invention is the provision of an automatically operable ap- 'paratus which is well adapted to supply a large number of individual receptacles with accurately measured quantities or frac'tionsof liquid orother fluent substance. The apparatus of the present invention is intended primarily for use as a frac ti'onscollector in chromatographic analysis, but it will be understood that the apparatus embodying the present invention may be used 'for other purposes.

The invention and the above mentioned and other objects, features and advantages thereof will "be fully understood "from the following description considered in connectionviith the accompanying illustrative drawings.

In the drawings:

Fig. 1 is a perspective view of an automatic fraction-collector apparatus embodying the present invention;

'Fig. 2 is a plan View, partly in section on :the line 2- 2 of Fig. 1, with'parts .cut away for the purpose of illustration;

Fig. 3 is a vertical sectional view 10D. the line 3-3 of'Fig."'2;

Fig. l is a sectional view on the line 4-4 of Fig. 3';

Fig. 5 "is *a sectional View on the line 5-5 of Fig. *1;

Fig. 6 is a "sectional view on the "line 6-6 of Fi Fi'g. '7 isa detailed perspectiveyiew of apart of "the apparatus;

Fig. 7.A.is "a -sectional view on'the "lineTA-"IA of Fig- '7.;

fig. .8 is a vertical sectional view on the line 8- 8 :of Fig. 15; v

Fig. 9 is a horizontal sectional view .on the "line 9-9 of Fig. 8.;

.Fig. 105s aside view iofeertain of the parts of theapparatus;

.Fig. 1-1 is a perspectiveview .of .a mechanism forming part of the apparatus;

Fig. 121s a sectional view-on the :line Ii-420i Fig. 2 with parts shown .in elevation;

,Fi'g. 113iis asedtionalview on the line 5|-'3--'l*3 of Fig. 12;

Fig. 114 *is a perspective view .of a mechanism forming part of the apparatus, certain pa-rts of said mechanism being shownqin zsection "I5 :is a v'iewpartly in elevatiowandipartly in section;

Fig. 16 is a sectional view on the line TB-f6 er Fig. 15;

.Fig. 17 is a bottom view of the control unit;

Fig. l8'isa circuit diagram of the electrical and electronic devices of the apparatus.

Briefly described, the apparatus of the present invention comprises a movable rack on which a plurality of receptacles are arranged in each of a plurality of laterally related rows each of which extends in the direction of movement of the rack. A control device having a passage therethrough for the liquid or other substance which is "to be supplied to said receptacles is mounted for movement laterally of the receptacle-rows ofthe rack. The rack is moved step'by step to-carry each receptacle to a position at "the outlet of the control device for the supply of the substance to eac'h're ceptacle. When the substance is to be supplied to more than one row of receptacles, the control device is moved automatically "from one row to another. Indexing mechanisms are provided for predetermining the number of receptacles which are to be supplied with the substance, and means including a timing device or counter areprovided for accurately determining and measuring the quantity of substance to be supplied to each of said predetermined number of receptacles. An electric motor is utilized for actuating the rackmoving mechanism and for operating the indexing mechanismsaiter the'latter have been manually adjusted or set to determine the number of receptacles to be supplied or charged with the substance, whereby the operation of the apparatus is terminated as soon as the "last receptacle is charged. *The motor-is stationary during the time eachreceptacle is being charged and as soon as ithas received its predetermined charge or guanti'ty of the particular substance, the motor is uperated, under the control of the timing device, to move the rack another step forpresenting-the next receptacle in position to receive its charge. The apparatus preferably includes means to 'interrupt the supply of the substance to any one of the receptacles in case of defective operation of the apparatus and also at the'end of the predetermined number of rack movements as set by the indexing mechanism.

The apparatus, in the form herein described, specifically designedfor a use as a fraction collector in chromatographic analysis. See for example, Principles and Practice of Chromatography by Zechmeister and cholnoky, Trans-- lated by "Bachrach and Robinson, published "by JohnWileytrSons, inc, New York. In this particular --use "of the apparatus a liquid is passed through or in contact with an absorbent substance of the column'in a tube, according to known practice in the art of chromatography, and issues from the outlet of said tube drop by drop, and similarly passes, drop by drop, through the passage of the above mentioned control device. A photo-electric cell is disposed in said control unit and is operable, in response to the intermittent interruption of light by said drops, to control a relay which in turn controls the su ply of electric pulses to the above mentioned counter whereby to measure the uantity of liquid supplied to each of the receptacles. It will be understood that the duration of the interval between two successive movements of the rack determines the quantity of liquid supplied to each receptacle, and that this interval of rest of the rack is controlled by the counter which. as explained above, controls the operations of the motor which moves the rack.

The apparatus will now be described in detail with reference to the above ment oned use thereof, but it will be understood that it may be used for other purposes.

In the use to which the apparatus is presently being put, accurately measured uniform quantities of liquid are collected in a multiplicity of test tubes or other suitable receptacles or conta-ners which, in the form of the apparatus herein disclosed, are carried by a rotatable rack I (Figs. 2 and 3). The liquid receiving receptacles or containers, a few of which are indicated at T in Fig. 3, are disposed in each of a plurality of laterally related rows, here shown as circular rows, the rack or container-supporting means In being circular. The containers rest on the bottom I2 of v the rack and are held removably in upright position and in uniform circumferentially spaced relations in each row by the horizontal plates l4 and I6 which are secured in vertically spaced relation, by the spacing sleeves l8 and companion bolts 20. For this purpose plate I4 is provided with a plurality of circumferentially spaced openings 2| for the outermost row of containers, and similar openings are provided in plate I4 for each of the other rows, there being four of such rows, in the apparatus as now constructed, as shown in Fig. 2. The lower plate I6 is similarly provided with four circular rows of circumferentially spaced openings as indicated at 21a in Fig. 3, the openings in each row being in registry with the openings in the respective rows of plate l4.

Back In is mounted for rotation about a vertical axis, as hereinafter more particularly described, and is moved intermittently, i. e., stepwise, for presenting each of the containers of each row successively at the liquid-receiving station at which the material-supply device and control unit 22 (Fig. 1) is mounted. It will be noted that the rack is disposed within a stationary housing 24. provided with a removable cover 26 and that the latter has a slot or opening 28 to allow the passage of the liquid from the outlet 25 of unit 22 into the receptacle T at the liquid receiving station. The supply device and control unit 22 is mounted for controlled step movement laterally of the rows of containers into positions in which the liquid outlet 25 of said control unit registers with the containers in each of the laterally related rows, respectively, of the rack. More particularly, the control unit 22 may be first positioned in registry with the outermost row of containers so as to supply liquid to each of the containers in said outermost row during one revolution of rack l 0, after which the control unit 22 is moved in succession, inwardly toward the center 4 of the rack, to the other rows for supplying liquid to each of the containers of each of said other rows during the next three revolutions of the rack.

The supply and control unit22 is mounted on a vertical post 30 and turns with the latter about the vertical axis of said post in moving from one row of containers or receptacles T to each of said other rows. Accordingly, the outlet 25 of the control unit 22 moves in an arcuate path in the movement of the control unit from one row of receptacles to another. In this connection, it will be noted that opening 28 is arcuately shaped and has its center of curvature at the axis of post 30,

and further it will be observed that as clearly shown in Fig. 2 the laterally aligned openings in plates l4 and I5 are disposed along the arc of a circle which has its center at the axis of post 30 when each set of laterally related openings of the several rows are at the liquid-receiving station as indicated in dotted lines at 32 in Fig. 2.

As illustrated in Fig. 1, the liquid which is supplied to the receptacles on the rack II! is provided in a supply container 34 having an adjustable valve 36 at its outlet from which the liquid flows through a tube 38 of the column for treatment by a substance contained therein, depending upon the process for which the apparatus is to be used. From the outlet of the tube 38 the liquid flows intermittently, i. e., drop by drop, the drops being of the same volumetric size, into the funnel 40 carried by the control unit 22. The drops of liquid pass through a transparent glass tube. 42 which forms a liquid or material-supply passage in the control unit 22 (Fig. 15) located between a photo-electric cell 44 and a companion exciter lamp 45 mounted within the casing 48 of saidcontrol unit. As each drop of liquid passes across the path of light from the lamp 46 to the photoelectric cell 44, a relay, subsequently described, is operable under the control of said photo-electric cell and mechanism, subsequently described, operates under the control of said relay, after the predetermined drops of liquid are supplied to the test tube at the liquid receiving station, to turn the rack in one step whereby to bring the next test tube into position at the liquid receiving station. More particularly, the passage of each drop of liquid between the photo-electric cell and the exciter lamp 4-6 interrupts the light to the cell and initiates an electric impulse which is transmitted to a suitable impulse counter mechanism which is adjustable and may be pre-set so as to automatically control the intermittent movement of rack In. Supply container 34 and column tube 38 move as a unit with control unit 22. For this purpose container 34 and tube38 are carried by supports 48 andil), respectively, which are releasablysecu'red to post 30 in any suitable way as by clampingrews 52 and 54. respectively.

, Rack I0 is turned intermittently in order to carry the liquid-receiving receptaclsT successively to the liquid-receiving station and allow suflicient time of each receptacle at said'station to receive a predetermined quantity or charge of liquid. After all of the receptacles in one row are supplied with the predetermined quantities of liquid, the control unit is moved automatically to the next row. In the apparatus which has already been constructed and operated pursuant to the present invention, there is provision for 50;-test tubes in each of the four rows, or a total of 200 test tubes. As will hereinafter be explained, the apparatus may be set so as to supply a. predetermined quantity of liquid to all of the 200 test tubes or to any predetermined smaller number of test tubes, according to re quirements.

Rack I is mounted for turning movement on a stationary vertical shaft 60 (Figs. 3 and 8). Said rack is secured to a casting 62 having a hub 64. Bearings 65 and 63 are provided for antifriction purposes between the rack and the shaft 60. As shown in Fig. 8 casting 52 which carries the rack is supported on the horizontal shoulder I0 of shaft 60. When the cover 25 is removed, the rack may be removed from the shaft. Thus, it will be noted that the rack is conveniently portable. A pin I2 is threaded into the upper end of shaft ed, as shown in Fig. 3, and cover 26 is provided with a central recessed part I4 which engages the upper end of said pin'for centering the cover on the rack housing 24. Any suitable means (not shown) may be provided on the cover and on the housing so as to position the cover with the opening 23 thereof in register with the liquid outlet 25 of the control unit 22.

Stationary shaft 60 is mounted in upright position in a frame I5 (Figs. 8 and 9) and more particularly in a fixed cylindrical part It of said frame. The frame is rigidly secured in any suitableway, as by screws 80, to the bottom 22 of the base 84 which as here shown is in the form of a housing for the mechanism mounted in said base. The top 86 of said housing provides a support for the rack housing 24. As shown in Fig. 3 housing 24 is preferably made of transparent material so that the receptacles and the contents thereof may be inspected without requiring removal of the rack from its housing. The front of the base-housing s4 is normally closed by a removable wall member 88 which provides a control panel for the various manually operable control devices provided in the apparatus as hereinafter described.

Stationary rods 89a and 8% are secured at their lower ends to base 84 and. are connected at their upper ends by a triangular frame member 90. Post an on which device 22 is mounted is formed in sections and comprises as one section thereof an upper tube or sleeve 9| having a rotary bearing 92 at a corner of frame member 90 the lower end portion of tube 9| having unit 22 secured adjust-ably thereto in any suitable way, as bya set screw em. The other section of post 30 comprises a tube or sleeve 93 which has a rotary bearing 93a (Fig. 12) at the top of base 84 by which sleeve 93 is supported in upright position. The upper end portion of sleeve 93 projects into unit 22 and the latter is secured adjustably to said upper end portion in any suit able way as by pin 94 and the take-up nut s4d (Fig. 17). Pin as has an arcuate recess 3422' which engages theupper end portion of sleeve 93. By threading nut 94a on pin 94 against the adjacent portion of unit 22, the arcuate portion 94b or pin 94 is clamped against the upper end portion of sleeve 93 whereby to secure unit 22 to said sleeve. It will be noted that sleeves e! and 93 are of larger diameter than rod 89 so that post 30 may turn around its longitudinal axis around said stationary rod without engaging the latter. The upper end 93b of sleeve 93 is spaced from the lower end SIIb of sleeve BI and is open within the casing of unit 22. An opening 93c is provided in the side of sleeve 93 at the lowerf the rack precisely the angular distance reguired part thereof within the housing of base 134. Said opening 930 and the open upper end of sleeve as provide for the electric :wires (not shown) to it i) photo-electric cell 44 and lamp 46, as well as to other electrical devices in unit 22. -It will be understood that the electric wires extend through sleeve 93 in the space between the latter and rod 89 and have their terminals in unit 22 and the housing of base 84.

The mechanism for turning rack I0 comprises the gear unit 93 which is mounted for sliding movement longitudinally of stationary shaft 60 and for rotation about the axis of said shaft. Said gear unit comprises a gear I00 which is releasably engageable with the teeth or projections I02 (Figs. 3, 4 and s) fixed to the rack-carrying member 62. More particularly, as here shown, teeth I62 are fixed to a plate I04 which is rigidly fastened to rack-carrying part 62 as shown in Fig. 8. Teeth I02 are slidably engageable with the teeth of gear I00 axially of said gear in the grooves between said gear teeth but are not otherwise movable in relation to said gear teeth when said gear engages teeth I02. Gear unit 98 also includes a gear I06 which meshes with a driving gear I08 when gear I00 of said gear unit is in driving engagement with the teeth I 62 of the rack-carrying member 62. Gear I03 is fixed to and rotated by a shaft I I0 which is journaled for rotation in the parts I I2and II4 of frame 76. Said shaft I If] is provided with an actuating gear I It driven by a worm H8 carried by a shaft I20 journaled for rotation in frame It (Figs. 8 and 9). A Geneva gear mechanism is provided for turn ing shaft see intermittently whereby to turn rack In one step at a time during the operation of the apparatus. The Geneva gear mechanism comprises the Geneva gear I22, which is fixed to shaft I20, and the cooperating gear device I24 of the Geneva gear movement, said cooperating Geneva gear device being fixed to a rotatable shaft I46 which is mounted for rotation in frame 76. It will be noted that, as usual, the cooperate ing gear device I24 of the Geneva gear movement includes a pin I48 which is engageable in the cire cumferentially spaced radial slots of the Geneva gear I22 for turning the latter intermittently during the rotation of shaft I45. Shaft I is actuated by an electric motor M which has a driving connection with said shaft by the worm I50 rotated by the shaft of said motor and by the cgoperating worm wheel or gear I52 fixed to shaft s Switch-operating mechanisms here shown as cams I54 and I56 are fixed to and rotated by shaft I46 for momentarily closing normally open switches I58 and I60, respectively, which are mounted on brackets I62 and I64 carried by frame 16. Said switches are preferably of the micro-switch type, but may be of any other type, and each includes a pin I which is engaged by the cams 54 and Hit, respectively, for momen tariiy closing the normally open contacts of the switches. These switches cooperate with other devices hereinafter described for controlling the operation of motor M. The arrangement and relation between the parts of the motor-operated mechanisms is such that shaft I46makes only one revolution during each operation of the motor under the control of switches I58 and I and the associated control devices hereinafter to be described in detail. It will be understood that when gear N30 is in driving engagement with rack it, the operation of motor M is such as to turn to bring the liquid-receiving receptacles T in $1161 cessionin each row, to th I e liquid-receiving stastion at which control unit '22 is positioned. so that during the successive movements of the rack all of the liquid-receiving receptacles of each row are presented at the liquid-receiving station, in succession, and are there held for a sufficient length of time to receive therein a predetermined, accurately measured quantity of liquid. Provision is made for moving gear unit 98 longitudinally of shaft 60 for engaging gears I00 and I08 with rack I0 and driving gear I08 respectively and for disengaging the gears of said unit from said rack and from said driving gear. For this purpose gear unit 98 includes a gearshift sleeve I68 which is interposed between gears I 00 and I06 in fixed relation thereto for operation by a gear-shift fork I'I0 which is mounted for pivotal movement in frame 16 by the pivot pins I12. Gear-shift fork I10 is operated by a rotary control knob I14 disposed at thefront of control panel 88. I16 journaled in a bearing portion I18 of frame 16. A crank I80 is fixed to shaft I16 and is provided with a crank pin I82 which engages a link I84, there being a universal or ball and socket joint I86 between said crank pin and link. The upper end of link I84 is connected to a rod I88 which is fixed to the cross arm of gear shift fork I10, there being a universal or ball and socket joint I90 between said link and said rod.

Indexing mechanisms are provided in the apparatus for predetermining the number of receptacles, up to the capacity of the apparatus, to be supplied with liquid during the operation of the apparatus. The indexing mechanisms include the gears I92, I94, I98, and I98 and associated devices which will be referred to as the description proceeds. Gear I92 is fixed to a shaft 200 which is journaled for rotation in the bearing portions 202 and 204 of frame I6. Gear I92 meshes with'gear I94 and the latter meshes with gear I96. Each of said gears I92, I94, I96 has 50 teeth, corresponding to the number of liquid receiving receptacles in each receptacle-row of rack I0, so that one complete revolution of the rack is accompanied by one complete revolution of each of said gears. Shaft 200 may be turned by a control or indexing knob 206 disposed at the front of panel 88. Said control knob is fixed to shaft 208 journaled for turning movement in part 2I0 of frame 16. Said shaft 208 is provided with bevel gear 2I2, and a companion bevel gear 2 I4 is fixed to shaft 200 whereby turning of shaft 208 by knob 206 is effective to turn shaft 200. A gear 2I8 is fixed to shaft 200 for turning the latter, said gear 2 I6 being at all times in mesh with gear I06 of gear unit 98. It will be understood that when gear I06 is in mesh with gear I08 the latter is operatively connected to shaft 200 for turning the latter and that this turning movement of shaft 200 by gear I08 through gears I06 and 2 I 6,- occurs during each partial rotary or step movement of the rack I0, by gear I08 operating through gear I00 and the companion teeth I02 of the rack.

Gear member I98 is arranged to be operatively connected to sleeve 93 of post 30 for turning the latter a predetermined angular distance whereby to position the control unit 22, and more particularly the liquid outlet 25 of the latter, in registry with the next row of receptacles on the rack after all of the receptacles of the preceding row are supplied with liquid, assuming that more than 50 receptacles are to be supplied with liquid from the supply receptacle. Provision is nladefor turning gear I98 step-wise a predetermined distance under the control of gear I98 Said knob is fixed to a rotary shaft and for holding said gear I98 stationary except when operated by gear I96. For this purpose a gear element 2 I8 is mounted in fixed relation to gear I96, for operation by the latter, said gear member 2I8 being securely but releasably fastened to plate 220 which is in fixed relation to and rotates with gear I96. As shown in Fig. 5 gear element 2I8 has only one tooth-receiving groove indicated at 222 in registry with a radial groove 223 which is open at the peripheral edge 22Ia of plate 22I. A gear mechanism 224 shown more clearly in Figs. 5, 7A, 7 and 12 is arranged in position to be actuated by gear member 2 I8 for turning gear I98. The gear mechanism 224 comprises, in fixed relation, a gear 226 having three teeth and a. gear 228 having six teeth. These gears may be made in one piece and are fixed on a shaft 230 carried by the fixed bracket plates 232 and 234. It will be observed that gear 228 is at all times in mesh with gear I98 but that gear 228 and gear member 2I8 are in such relation that during one complete rotation of gear I96 gear member 2! engages only one tooth of gear 228 and then disengages said gear completely, so that upon each operation of gear member 2I8, pursuant to rotation of the gear I96; gear I98 is rotated a predetermined angular distance for turning post 30 the same angular distance. Gear 226 in conjunction with plate 220 prevents gear I 98 from turning except when gear 228 is actuated by member 2I8 after gear I96 is turned a. predetermined distance depending upon the setting of the indexing gears by operation of indexing knob 206. As shown in Fig. 7A, gear 226 is disposed with two teeth thereof in face contact with the circular edge 22Ia of plate 22I at circumferentially spaced points, whereby gear device 224 is prevented from turning except when one of said edge-contacting teeth of gear 226 is in position at the entrance to groove 223 pursuant to the predetermined angular movement of plate 220 by gear I96. 7 In the relative position of plate 220 and gear 226 at which one of the teeth of the latter can enter groove 223, gear 228 is engaged by gear member 2I8 and during the step-movement of gear I96 which then occurs gear member 2 I8 turns gear 228 and thereby turns gear I98 one step through an angular distance determined by the gear ratio of gears I98 and 228. During thisactuation of gear 228, gear 226 is correspondingly turned so that two teeth thereof are again disposed in contact with the circular edge of plate 220 whereby to prevent gears 228 and I98 from tuming until plate 220 makes a complete revolution. It will be noted that gears 226 and 228 are of equal diameter so that an angular movementof gear 228 by, gear member 2I8 always bring two teeth of gear 226 into contact with the-edge 22Ia-,of plate 220 at points spaced circumferentially of the latter so that gear-226. cannot turn in either direction and hence prevents gear I from turning in either direction. Accordingly when gear I98 is operatively connected to sleeve 93 of post 30 of control unit 22, the latter is held in set position with respect to the receptacle-row of rack I0 and, in the operation of the apparatus, is prevented from moving from said position until gear I98 is actuated as just described. The mechanism comprising plate 220, member 2I8 and cooperating gear mechanisms 226, 228 operate as a lostmotion'mechanism so that the indexing gears may be turned up to one revolution without operating. gear I98 thus providing for a complete revolution of rack ID, if required, according to the number of receptacles to be charged, before gear I98 is cpcrated to turn post 30 for moving unit 22 from its position over one receptacle row to a position over the next receptacle row or to a position for interrupting the operation of the apparatus. The mechanism just referred to as operating as alost motion mechanism or device also operates as described above to hold the control unit or material supply device 22 in its set position and prevents movement thereof until gear I95 has completed its predetermined movement in re sponse to the number of step movements of rack l predetermined by setting of the indexing mechanism by knob 206 on the control panel.

Provision is made for operatively connecting gear I98 to post 30 and for disengaging said 013* erative connection so that said post and the control unit 22 carried thereby may be turned, free of gear 198, for manually positioning the control unit 22 at the desired row of receptacles. More particularly, it will :be understood that when the receptacles in all of the rows are to be supplied with liquid, unit 22 is positioned so that its liquid outlet 25 is in registr with the outermost receptacle-row of the rack. In order accurately to determine the position of the outlet 25 of the unit 22 in relation to any particular row of receptacles carried by the rack, depending upon the number of receptacles which are to be supplied with liquid, a stationary dial plate 236 is provided on the cover 86 of the :mechanism housing or base .86 and a pointer 233 is provided on the part 240 which turns with the post 30; is secured to sleeve :93 .in any suitable way as by a set screw 12. .As will be explained subsequently; the setting of the post :so that pointer '238 indicates a corresponding reading on dial 236 and the setting of knob 2416 in relation to the dial 242 on .front panel :86 determine the number of receptacles which are :to be supplied "with liquid and also determine the time of iserurination of the operation of the apparatus :following 'the initiation of said operation and the setting of the liquid measuring or timing device at-later explained As indicated above, gear 198 :is disengaged fromits driving relation with post=3il tosfacilitate the turning of said post for positio n he con trol unit 22 manually in relation to therecep- ?tacle rows on the rack All. After unit 122 :is positioned, the-driving relation between gear I98 and the post restored; Forthus engagingrand xdisengaging gear 1198 "from its driving oonnec tion with post 30, the mechanism which will now be described is provided. This mechanismim eludes the unit 244 12-) which carries gear I at its'lower end and agear 1245 at its-upper end. Said gear unit 2-244 is niounted for rotation co-axially with sleeve .92 of post 3!] and for that purpose is provided with arotary bearing 24] atits 'lowerend whereby it is journalled for rotationin-thesupncrt 24 1c fixed to base :82 The upper partof gear unit 244 has an innercylin- -drical surface 24 1a in which :thelower endportion of sleeve 93 is received in movable contact therewith. The :gear .246 of unit L244, which .is stationary longitudinally dfrod 89, constitutes a clutchmember whic'h'is releasablyengageable.by a movable clutch member 248 which .is ,splined to sleeve Qiformovement longitudinally thereat and .for rotation therewith. Clutch member Z2l'8hasaplura1ity of oircumferentiallyspaced .hdgprojections or. prongs '25fl arranged to on Part :240 is a conical member which gage clutch member 2 28 in the spaces or grooves between the teeth of the latter. Prongs 250 have a sliding fit in the grooves between the teeth of gear 2 5-6 axially of the latter but do not otherwise move in relaion to said gear teeth when the clutch members are engaged.

A knob 252i is provided at the front or control panel 88 for operating a mechanism for moving clutch 2% into .and out of engagement with clutch gear 228. This last-mentioned mechanism comprises a fork 2 54 which engages a collar 2-56 (Fig. 14) with respect towhich clutch 248 may turn about the axis of post 39. Said fork is pivoted at one end thereof to a stationary part of the base as indicated at 258 in Fig. 12, and the opposite end of said fork is engaged by a crank pin 2.60 carried the crank 262 which is fixed to and turnable by the shaft 252 to which knob 252 is secured. It will be understood that by turning the knob 252 as to lower the crank pin 260, the weight of clutch 2% is sufiicient to cause said clutch to move toward gear 246 for engagement of prongs 25? in the grooves of said gear, thus establishing a driving engagement between gcar I98 and sleeve 93 of the post.

vA cam 265 is fixed to sleeve 93 so as to turn therewith whereby to open a normall closed switch 268 for interrupting the main electric circuit, independently of all other circuit controls, and thus to terminate the operation of the .apparatus when the post 39 has been turnedapredetermined distance in a counterclockwise xii-- rection (as view from the top in Fig. 1) from its initially .set position, after the predetermined number of receptacles are supplied with liquid pursuant to the setting of the post in relation to dial 236 and the setting of knob 206 in relation to dial 242. As shown in .Fig. 13 cam 26.6 is arranged to engage .a spring follower 270 which engages an actuating member .of switch 2-6.8 for moving the movable contact member of the switch to its open position. Switch 268 ispreferably of the micro-switch type, although itoanhe any suitable normally closed stop switch. A ten- .sion spring 21 3 is-connectedat one end thereof to a part .216 fixed to the baselfi l and at vits opposite end to an eye2'l8 which projects from the collar .280 which is in fixed relation to thepost. Spring .2'14 tends to turn the .post and theclutch 248 mounted thereon whereby to prevent .lost motion between the clutch prongs 259 and the companion teeth of gear 246 when the clutch is engaged with saidgear.

Provisionis made inthe apparatusforpreventmg the flow of .liquid into any receptacle T at the end of the operation of the apparatus or in the event that the exciter lamp 46 of the photo-electric cell burns out or is not illuminated. For this purpose the control unit .isprovided with a liquid intercepting device 282 which is .carried by the control unit 22 in position at the bottom thereof. Said intercepting device comprises a tube .284 mounted in a bracket 286 which is secured to a shaft 288, .A normally energized solenoid 295i is arranged in theoontrol circuit of the apparatus, as will be .subsequently described in further detail with refer- .enceto the circuit diagram (Fig. 18),, so that during the normaloperation of the apparatus and before the termination of said operation .said solenoid is energized and the solenoid core 2 92 which .is connected by vmember293 to the crank arm 294 of shaft 288 holds said shaft in ,a position in which the liquid-intercepting device 2 82 is in its retractediposition out of registry with the liquid outlet 25, as shown in Fig. 1'7, so that the liquid may pass to the test tube or other receptacle in registry with said outlet. In the event, however, that the solenoid 290 is de-ener gized, at the end of the operation of the apparatus, or due to a defective control condition, spring 296 is effective to turn shaft 288 for moving the liquid intercepting device 282 so that the cup 208 at the liquid-receiving end or said device is brought into registry with the outlet 25 for thus intercepting the flow of liquid from said outlet to the receptacle '1 on the rack and for transmitting the intercepted liquid to a suitable collection receptacle indicated at R. in Fig. 1. The tube 284 or the liquid intercepting device is connected by a rubber or other flexible tube 300 to an outlet fitting 302 releasably mounted on the vertical wall of the housing-base 84 in any suitable way as by a releasable spring clamp 304.

When solenoid 290 is de-energized and it is desired to move the liquid-intercepting device 282 to its retracted position (Fig. 1'7), a knob 306 may be turned for operating cam 308 to move part 293 for turning shaft 268. The control unit 22 is provided with viewing openings 3I0 at both sides thereof at opposite sides 01' the liquid passage 42, which is transparent, so that the passage of liquid through the control unit may be observed. A150, at opposite sides or the casing of the control unit there are periora'ted plates 3I2, and at the top of the casing there is a ventilating cap 3M as an on" take tor the heat of the exciter lamp 46. It W111 be noted that the tunnel 40 is removably secured in position on the control unit by an externally threaded nut 3I6 which engages a split or COlIlPIESSlOlB bushing 3I8 which grips the stem of the Iunnel, providing an ad ustable securing device 1or funnels which may have stems or different diameters.

Summarizing the operation of the apparatus as thus far specincally described, it will be ob-- served that it liquid is to be supplied to not more than 50 receptacles, post 30 is ad usted to position the control unit 22 with its liquid outlet in registry with the innermost receptacle row of rack I0, as determined by the position of the pointer 238 in relation to dial 236. This adjustment of post 30 is performed while clutch 248 is disengaged from gear 246 as indicated by the position of knob 252 when its pointer is at the legend disengaged on the control panel 88. After the post is adjusted knob 252 is turned to the engaged position, indicated on the control panel, 80, for engaging clutch 248 with the driving gear 246. Post 30 is held in this adjusted position by the engagement of gear I98 with gear228 of gear unit 224 in conjunction with plate 220 until gear member 2H! engages one of the teeth of gear 226 during the turning of indexing gear I96. The number of receptacles, in the innermost row, which are to be supplied with liquid is determined by operation of in- -dexing knob 206 which is turned for operating indexing gear I92 while the rack is disengaged from gear I of shift-gear unit 93 and while gear I06 of said unit is disengaged from driving gear I08. It will be understood that for determining the number of receptacles of any particular row which are to be filled with liquid, knob 206 is turned in such direction as to turn gear I92 in a direction opposite to that in which said gear is turned when gear I06 is operated by the driving gear I'08at which times the rack is turned in the same direction by the engagement of gear I00 with said rack. If more than 50 and not more than I00 receptacles are to be supplied with liquid, post 30 is adjusted so that the liquid outlet of the control unit is positioned in registry with the second innermost receptacle-row of the rack, and knob 206 is adjusted to position the indexing gears for determining the number of receptacles in that par-'- ticular row which are to be supplied with liquid. When the post and knob 206 are adjusted for the particular number of receptacles, the post remains stationary until the selected number of receptacles in the second innermostrow are supplied with liquid, whereupon post 30 is turned automatically by the operation ofgear 2! on gear'member 228 to turn the post so as to position the outlet 25 of the control unit into registry with the innermost receptacle row of the rack. It will be obvious that if more than I00 and not more than I receptacles are tobe supplied with liquid post 30 is adjusted so that its liquid outlet is positioned in registry with the second outermost receptacle row of the rack and that knob 206 is adjusted for determining the exact number of receptacles within this range; and likewise it is obvious that if more than receptacles are to be supplied with liquid post 30 is adjusted so. that the liquid outlet 25 of the control unit is in registrywith the outermost receptacle row of the rack and knob 206 is adjusted for determining the exact number of receptacles, between 150 and 200, to be supplied with liquid.

It is apparent from the above description that when the rate of flow of liquid through the control unit is adjusted so that said rate of flow is uniformly constant, the quantity of liquid which is supplied to each receptacle is determined by the length of time during which that particular receptacle is held stationary in position under the liquid outlet 25 of the control unit and this length of time is the same as the duration of the period during which the rack is stationary, that is, the length of time between two successive operations of motor M. This length of time may be predetermined by any suitable timing device but in the present instance in view of the drop-by-drop supply of liquid, the timing device is of the type which operates as a drop counter. This timing device indicated at 320 is mounted on control panel 88 and has a suitably calibrated dial and a timeadjusting knob 322. The timing device or counter may be of any'suitable type, and since it is not in itself part of the present invention it is not herein described specifically, but certain parts thereof are hereinafter referred to in explaining the operation of the apparatus. The counter or timing device utilized in the apparatus as actually constructed and operated is an instantaneous reset counter of the type described in U. S. Patent No. 2,329,447 and was supplied by Eagle Signal Corporation, Mollne. Illinois. When a start switch, in this case switch I58 iFigs. 9 and 18), is closed, a clutch coil, 1. e., a coil of an electro-magnetically operated clutch, is engaged and impulses transmitted to a count or ratchet-operating coil of an electro-magnet are efiective to operate the ratchet, and when the clutch coil is de-energized, the counter is automatically reset to its starting position. The count coil and the ratchet operated thereby take the place of the synchronous or clock motor 22 of said patent for operating: the timer short 2% 0t saint patent and the. switch. connections in the circuit are:- modificdl as r quired. as indic ted in: Fig, 18,, as; will, be. readily apparent. The. clutch coil; and count coil and. the; switching connections are schematically shown. inFig, 18F and will be; pres-- ently more particularly referred to in. thedescription oi the; operation. otthe apparatus;

AS shown. inFis, 18., thephotoselectric; cell M of: control. unit. 22; is. connected to -thelelectroni tube; 32.4,, which; as; here shown is. at GSJH. tubes in. an electronic-relay circuit,v This. tullev is;

biased so thatzit is: normally non-conducting but. heccmes conducting; under-the. control .of photos lectri .11, M. eachtime a, drop of; liquid; passes" between said; cell. and, the, exciton lamp. 4.6; and. cuts. off. the; light trom; said; lamp: to; said. cell.- An electronic tube: 325;. here: shown.- asa. SSNZQ tube, has an. electronic.- discharge: systemi therein connected to thewindinr. of: magnetic. relay 32$; andnnerable; underthe. control of tube; sat. The." section of. tube 32s. which; is: connected 150i relay;- 3 2;8:31I1di.11l1h8;3244i$ indicated. at:.A-.. This secticn is; normally conducting and; energizes: the; Winding. of. relay" 32.8; so.; that-. the; contacts 33.0, and: of; said; relay:- are. nqrmally open... When. aapulser receivedbyytube;324tsection1Alon tube. 326 becomes non-conducting and. as; a. result: he-\winding; of; relay, 328 is; dcenergized; and; cons tacts;;3.3.0 and;3;3)c of; said; relay ClOSBiSQ' thati-a. pulse is; sentzto; the. count; or: ratchet-operating; coil. 3.35;:01'. the} timing device. 32 0.. Bower; for; he relay; circuit. is provided. by. the; transformer: secondary WindingQSMnthc primary; winding 3'40 otsaid transformer; being: connected; to: the). Sun-r lily line Ill; and L2 which: receive alternating; urrentfroma suitable sourca. 'llubatzt. con-1 ducts; current: only; during; the; positive half; or the. alternating; current; cycles. $021. that a..p,u1sat.-.-

n i-current'fiows throughthezrelay;circuit;.. Ac:.-- r

proy'rdedzztowsmoothz cordinaly;.,a...condenser; 34 2: the; voltage. across; the.' windings. of: relay: 32$. so; as-tojprevtentzit; from .followingzthez frequency: of the current through the tube:.., section... 5. oti tubs; 32 Grconstitutes; ax. halt: wave 1 rectifier: for

the. currents supplied by; then transformer: sec

ondary; winding 34.4.v The; sensitivity, control provided by the adjustable resistanceztidix:iscade justed by the aknob can on icon-tron panel; 88-,a..so

that thoefftctzof.theslightzzfrom lamp 4t ons photoaelectriclcell" 4.4.3 causesthe; gridiuofitubefiui to; bola negativczv with. respect tor the; cathodes, whereby Plate: current 1 through" saidrtube; iszcut; off as a result of this negative bias. Thelgridr cathode of section A of tube 326 is connected across. the; resistor* 34 8i in;v the; plate: cirouitcof tube 324;; The; voltagegdrop: acrosslthis resistor acts: as a bias voltage :to the; gridizolxsection': AilOf. tube 326,; but since voltage: across; this resistor: isznorm-allyizerorthefiowz of plate current in; sec-.-= tionrA. of tube; 32 li.:takes: place tsozthatithegwindw ing=;.of relay 32.8 isnormal1y energized;as;herein-- beforeindicated. Whenjight aonzthe .photoeelecs trio; cell; 4! is interrupted ,..upon :;the; passageeot: ardropxo:.-1iquid;across.the; light-beam; front lamp:

4t to; said. photo-electric :;c.ell,. ,the .znegative;. bias. on thergrid of lthertuhevsrflfiiiszzdecreasedzandithe:

plate circuit of.said.tubeaconducts:;curr.ent;where:.-. by the evoltage'. drop across..resistor::348 :produces. a1; negative bias across .the; .gridacathoder. of; sectation; A of; tube; 3 2 interrupting; thGfiifiOW? off curs rentingthe. plate. circuit oi. saidetube .and.;thus:. tie-energizing relay. 328; so that 1contact'ss330, 332:. close: and: completega. circuitcthrough :the :count.

statedr The condenser 350 acrossresistance 348 charges when tube 324 conducts currents and. after, said. tube is. cut ofi the charge across condenser 35!]? leaks oiT across resistor 348. and thereby maintains the grid of sectionA of tube 326 negatively biased and the circuit of the winding; of relay 32-8 lie-energized for ashort period. of time; after light is restored tothe photo-electric cell 44'. This circuit provides a quickv charge path:- and a slow discharge patlr for thecondenser 350 and in thiswayalight in terruption of: short duration when a. drop of: liquid: passes between: thephoto -e1ectriccell and theexciter lamp 46 is ini effect prolonged for as sufiicientlength 0t. time to enable the relay; 328% to." operate. The transformer secondary 352 provides" a source: of current for heating: the filamentsof tubes-324.: and 3-26.

A" step-downtransformer era connected: to sup ply.- lincs. and L2: is provided for energizing; the. exciter. lamp. anci the. winding" of solenoid- 290? which normally holds thev liquid: intercepting; device'iiiifi. in its retracted-position (Fig; his): as described. above...

Supply lines Li. and L2. are connected to aasuitL- able source. of: 6.0+cycle alternating; current through the; mainv manually. operable switch: 355 which. ismounted. on..the: control panel: 88 Said; control panel is; also provided with. an: electric receptacle. or; plugsin; socket 358: to" receiver mugrtorminalj 2501: on pplyingi the: operating: current: to the apparatus through said switcirtfit: The switch. acawhichis normally; closed but which is: opened; when post stl' turns to'itsi-endrposition at; the compl'etionof: the. operation of the: apt paratus; as. describe'dll above with. referenceto Fig. 13., is also shownlin; Eig;,.. ;8.-

Motor. M is. connected. directly; to line: L-li. by; wirev 3fitxand to. line 1.12%throughthaswitch 352? oi. the timing :device; ors'counterrta fi. Switch 3.62 stationary: contact 3813 which. is connected: to the motorby. wire.:.3.6i5,a.andi:a-companionmov' able. contact. 35a; which; is connected to line -111%. by wire: 3.18.. Contact; 3.58 engagedawithi the:

, companion. contact 1564 of. switch. 3.625 when the:

-- to; disengage contact; 353:: from-contact 364 101? opening; switch thus: interrupting, the: sup? ply'of current to. 'motor'M; It V1111 he: notedsthat. line Ll. is connected; to uene. terminal: of: clutch:- coil. 31 2: h'y wire .3='l fira'ndxzt-o P one terminal of: the; count or ratchet operating coil tcfi by Wire 3 75 and by wire 318;- Theothenterminal'ottlie' clutch coil' is-connected -to line-ll2- by wirc ttlii throu'gh switch [58; said switch and'thecompanion s'witclr its being connected to linc fi z by the wire 382? The other "terminal-of the" count orTatchet-"operating 'ccil tliii' is connected" to-the contact 3% ofre'lay'za'byiwire'ltildj and'as poiritedout above" when" contacttitc'is engaged with contact 332" said other end f of! coil" is "connected to "line? L2. for energizing. sai'd' coil'..

The timing. device 3253' .i'r'lcliides a stationary. contact. sac and... alcompanion. movable contact 388. These contactsarc-opcn when the clutch coilis. do-energizecl and are closed: when saidclutch coil: isenergized', contact. tits-beingtheir moved to engage contact 33t=byiarmature-33t i of saidwclutch coil-312 It will benotedrthatcon tacttBS isconnected-to.onerterminalof the clutch om ratchet...operating.,. coi11;3.3&1.as; hereinbeforci m: coil and ithat-imoyable:contacti 33a. is connacted v to line 'L: by wire an to complete a holding sir-'- cuit for said clutch coil.

The operation of the apparatus will now be described with reference to Fig. 18, it being assumed that the post 38 has been set and knob 2536 has been operated to actuate the indexing mechanism to determine the number of receptacles which are to be provided with liquid through the control unit 22 and that the knob 322 of the timing deviceor counter 328 has been set to determine the quantity of liquid to be supplied to each of said receptacles under the control of the photo-electric relay which is operable under the control of the photo-electric cell 44 in response to the movement of the drops of liquid from the funnel across the beam of light to said cell. When switch 356 is closed, motor M is connected across the lines LI and L2 through switch 362 of the timing device 328 and operates to turn shaft I46. When shaft I46 has turned a short distance, start switch I58 is closed momentarily by cam I54 and completes the circuit through the clutch coil 312 so that said coil is energized and opens the switch 362, at the same time closing the contacts 386 and 388 providing a holding circuit for the clutch coil 312 independently of switch I58. Although switch 362 is opened when clutch coil 312 is thus energized, the motor continues to operate for a short time, since the circuit therethrough is held closed momentarily at the switch I68 closed by cam I56 which is set to close switch I68 shortly before switch I58 is actuated by cam I54 and then toopen switch I68 a moment later, allowing one revolution of shaft I46 to take place. Motor M then stops and remains stationary until the count coil 336 has been energized a number of times corresponding to the setting of the knob 322 of the counter or timing device 320. After the predetermined number of pulses have been supplied to counter coil 336 under the control of relay 328, as described above, solenoid or clutch coil 312 is de-energizeol, contacts 386 and 388 being opened, and switch 862 is closed and the timer is automatically reset for the next operation. When contacts 366 and 388 are opened and clutch coil 312 is therefore de-energized switch 362 is closed, thus completing the circuit through motor M for operating shaft I46 through one revolution and thereby turning the rack one step by means of the Geneva gear movement described above with reference to Figs. 9 and 11. It will be understood that the time of each rack movement under the control of the photo-electric relay is less than the time between successive drops through outlet of device 22, so that as soon as the last drop of one series passes into its receptacle, the next receptacle is in position to receive the first drop of the next series.

The operating cycle is repeated for each receptacle to be supplied with liquid, and it will be noted that during each movement of the rack under the control of count coil 336 in response to the operation of the impulse switch, i. e., contacts 33 0, 332 of the photo-electric relay, a corresponding movement is imparted to the indexing gear I92 and by the latter to the indexing gear I96 so that when the last receptacle has been supplied with liquid gear member 2I8 engages gear 224 for operating gear I98 whereby to turn the post 38 to its end position at which the normally closed switch 268 is opened, thus terminat-' ing the operation of the apparatus, even though switch 356 remains closed. It will be noted that when switch 268 is opened automatically at the end of the operation of the apparatus the winding of solenoid 298 is de-energized so that the 1 liquid intercepting device 282 is moved by spring of the control unit, thus avoiding an oversupply of liquid to the last receptacle and also preventing overflow of said liquid in the apparatus. It will be apparent that when a drop-by-dropsupply of liquid to the receptacles is notrequ'ired or'when a drop-by-drop count is not required or advantageous in timing the rest intervals of rack Ill, any other suitable timing control of the operations of motor M may be provided; for example, the timing switch shown in the above mentioned patent operable by the synchronous or electric clock motor as described in said patent may be utilized for timing operations of motor M whereby to time the rest intervals of rack I8.

It will be observed that the provision for disengaging gear I98 from its driving connection with sleeve 93 of post 38 enables the latter to be moved for positioning unit 22 clear of the rack to a suitable position for convenience in adjusting the apparatus, including the drop-flow of the liquid, prior to setting the apparatus into operation for fraction collecting. It may be noted that the size of the liquid drop is determined by the outlet tip of funnel 48, said tip being so ground as to accurately pass a drop of a predetermined size. It will beobserved that the condenser lens 389 (Fig. 15) focusses the light from lamp 46 on the drop as the latter passes across the path of light from said lamp to cell 44.

It will be observed that the apparatus of the present invention is operable to supply an accurately measured quantity of liquid to each of a pre-determined large number of receptacles, without requiring the attention or presence of an attendant. Thus, for example once the opera-.

tion of the apparatus has been initiated, it may be left operating, overnight if necessary, until all of the selected number of receptacles are supplied with liquid, at which time the operation is automaticaliy terminated.

This is a division of my application Serial No. 112,389, filed September 5, 1947, now Patent No. 2,604,249, and assigned to the assignee of this application.

It will be understood that various changes in the details of construction and in the form and arrangement of parts may be made without departing from the underlying idea or principles of this invention within the scope of the appended claims. I

I claim:

1. Apparatus of the character described, comprising a substance-supply unit mounted for turning movement from one position to another position, a gear operatively connected to said unit for turning the latter from said one position to. said other position, and means for turning said gear and for preventing the same from turning between successive movements thereof, said means comprising a movable member having an edge extending in the direction of movement thereof and having a recess open at said edge, a gear member carried by said movable member at said recess, and a rotary gear mechanism having a gear in mesh with said first mentioned gear and positioned to mesh with said gear member and to be turned by the latter only at a predetermined point in the movement of said movable member, said gear mechanism having a second gear in fixed relation to said other gear thereof and having a smaller number of teeth than said ego-vases 1? other ,gear, said second gear having two teeth thereof in relatively movable contact --With said edge whereby said -'two gears of said gearmech'anism and said first mentioned gear are prevented from turning-except when one-of: said two teeth is at said recess. 7

2. Apparatus of the character described, comprising a substance-supply unit mounted for turning movement fromon'e position to another position, a gear operatively connected to said unit for :turning the latter from saidone position to said other position, and means for turning said gear and for preventing the same from turning between successive movements thereof, said means comprising a rotary-member having 'a 'c'ir' cular edge and a recess open'at said edge, "a gear mechanism mounted for turning movement about an raxisilocatedbetween the turning axis of said unit .and the turning :axis of said rotary memher, said gear mechanism "having a first gear "in mesh with said first mentioned gear and a secnd gear m'fixed 'cmaxia'l relation with said first gear of said gear mechanism and having two teeth in relatively movable contact with said edge of said rotary member whereby said two gearsof said-gearimechanism are prevented from turning except when one of :said .two teeth is at said recess, and means carried by said rotary member for turningsaid'gears of said gear mechanism when :said one of said teeth is at said recess.

33. Apparatus of the character described, comprisinga substance-supply unit, means mounting said unit for movement from one position :to another position, means including a gear for moving (said mounting means, means for operatively connecting said gear to said mounting meansfor moving said unit and fordisconnecting said gear from its said operative connection with said mounting means whereby said .unit .be moved independently of said gear :for movement to either :of "said positions, mechanism operatively connected to said gear for turning the 1atter intermittently, and means included in said mechanism for preventing said gear from turningrhetweensuccessive turning'movements thereof by said mechanism.

4. Apparatus of the character described, -comprising :a .substance supplyzunit, means mounting said :unit .for movement from one position .to another position, :means including a gear for moving said mounting means, means for operatively connecting said gear to said mounting means for moving said unit and :for disconnecting said gear from its said-operative connection with said mounting means whereby said unit may he moved independently "of said gear for movement to either of said positions, mechanism operatively connected to said gear for turning the latter intermittently, and means inc'ludedin said mechanism "for preventing said gear from turning between successive turning movements thereof by said-mechanism, said last mentioned "means including two relatively movable members and "a gear which 'is in mesh with said first mentioned gear and which is prevented from turning exceptin a predetermined position of one of said two relatively movable members relation to the other of said *two relatively movable 'me bers.

5. Apparatus of the character described, comprising a substance-Supply unit, means mounting said unit for movement from one position to another position, means including a gear for moving said mounting means, means for operatively connecting said gear to saidzmonnting means for *moving said unit and for disconnecting said gear from its :sa'id operative connection with said mounting means whereby said unit may be moved independently :of said gear for movement to either of said positions, :mechanism operatively connected to said gear iior turning the latter intermittently, and means ineluded in said "mechanism for preventing sa'id gear from turning between successive turning movements thereof by said mechanism, said'ias't mentioned means including 'two relatively movable members and a-gear which is in mesh with said first 'mentioned gear 'and which is prevented from turning except in a predetermined position of one of said "two relatively movable members in relation to the other of said two relatively movable members, and indexing means for moving one of said two relatively movable members in relation to the --other for "prede'ternfining the time of actuation of said first mentioned gear "by said "mechanism.

6. Apparatus'of the character described, comprising a gear unit mounted for rotation and for movement long itudina'liy of its axis from one position to another position, a receptacle rack mounted for movement, means for 'operatively connecting said rack releasably to said gear 'unit in one of said positions thereof for actuation by said gear unit, power operated means 'releasaibly connected to said gear 'unit for'tu-rning the same in said one position thereof, and indexing means including a gear in mesh with a 'gear of said for turning said unit when the latter is disconnected from said power-operated means, said'index-ing gear being in 'mesh with said gear ofsaid gear unit inboth of said positions thereof whereby said indexing means is actuated by said gear unit when the iat-ter is connected to said poweroperated means.

'7. Apparatus of the character described, comprising a gear unit mounted for rotation andf'oi' movement longitudinally of its axis from one position to another position, a receptacle #rack mounted for movement, means for operative'ly connecting said rack releasala'iy to said gear unit in one of said positions thereof for actuation by said gear unit, means 'rele'asably connected to said 'gear unit for turning the same in said one position thereof, powermpera'ted mechanism for actuating said gear-unit turning means intermittently, step by step, and indexing "means "including a gear in mesh with a gear of saidunit for turning said unit when the "latter is disconnected from said gear-unit turning means, said indexing gear being in 'mesh with said gear of said gear "unit in both of said positions thereof whereby said indexing means is actuated by said gear unit when the latter is connected to said gear-unit turning means.

'8. Apparatus of the character described, comprising a gear unit mounted for rotation and for movement longitudinaliy of its axis from one position to another position, a receptacle rack mounted for movement, means for operatively connecting said rack releasably to said gear unit in one of said positions thereof for actuation by said gear unit, means releasably connected to said gear unit vfor turning the same in said one position thereof, power-operated mechanism for actuating said gear-unit turning means intermittently, step by step, and indexing means in eluding a gear in mesh with a gear of said unit for turning said unit when the latter is disconnected from said gear-unit turning means, said 19 indexing gear being in mesh with said gear of said gear, unit in both of said positions thereof whereby said indexing means is actuated by said gear unit when the latter is connected to said gear-unit turning means, an electric motor for operating said power-operated mechanism, a, control circuit for said motor including control means for energizing said motor a predetermined number of times, once for each operation of said mechanism, at time-spaced intervals, and means operable under the control of said indexing means after said predetermined number of energizations of said motor to render said control circuit and control means ineffective to energize said motor.

9. Apparatus of the character described, comprising a unit mounted for rotation and for longitudinal movement from one position to another, said unit being adapted to drive a receptacle carrier, power-operated mechanism operatively connected to said unit in one of said positions for rotating said unit and operatively disconnected from, said unit in said other position thereof, means actuated by said unit when the latter is in said one of said positions, indexing means connected to said unit for rotating the latter when it is in said other position thereof, said indexing means being operatively connected to said unit for actuation by the latter when said unit is rotated by said power actuated means, and means operable under the control of said indexing means, after a predetermined operation thereof by said unit, to terminate the operations of said power-operated means.

10. Apparatus of the character described, comprising a unit mounted for rotation and for iongitudinal movement from one position to another, said unit being adapted to drive a receptacle carrier, power-operated mechanism operatively connected to said unit in one of said positions for rotating said unit and operatively disconnected from said unit in said other position thereof, means actuated by said unit when the latter is in said one of said positions, indexing means connected to said unit for rotating the latter, when it is in said other position thereof,

said indexing means being operatively connected to said unit for actuation by the latter when said unit is rotated by said power actuated means, an

electric motor for operating said power-operated mechanism, a control circuit for said motor mcluding control means for energizing said motor a predetermined number of times, once for each operation of said mechanism, at time-spaced intervals, and means operable under the control of said indexing means, after a predetermined number of operations thereof by said unit, to render said control circuit and control devices ineffective to energize said motor.

11. Apparatus of the character described, comprising a device having a material-supply passage, means mounting said device for movement from one position to another, means for moving said mounting means including a member mounted for movement, mechanism in operative engagement with said mounting means and operable by said member, means for disengaging said operative engagement whereby said device may be moved independently of said mechanism and said member for movement to either of said positions, mechanism operatively connected to said member for moving th latter intermittently, and means for preventing said member from moving between successive movements thereof by said latter mech anism.

12. Apparatus of the character described, comprising a device having a material-supply passage, means mounting said device for movement from one position to another, means for moving said mounting means including a member mounted for turning movement, mechanism in operative engagement with said mounting means and operable by said member, means for disengaging said operative engagement whereby said device may be moved independently of said mechanism and said member for movement to either of said positions, mechanism operatively connected to said member for turning the latter intermittently, and means for preventing said member from turning between successive turning movements thereof by said latter mechanism.

13. Apparatus of the character described, comprising a device having a material-supply passage, means mounting said device for movement fromone position toanother, means for moving said mounting means including a rotary member mounted for turning movement, mechanism in operative engagement with said mounting means and operable by said rotary member, means for disengaging said operative engagement whereby said device may be moved independently of said, mechanism and said member for movement to either of said positions, mechanism operatively connected to said member for turning the latter intermittently, and means for preventing said member from turning between successiveturning movements thereof by said latter mechanism.

14. Apparatus of the character described, comprising a device having a material-supply passage, means mounting said device for movement from one position to another, means including a gear for moving said mounting means, means for operatively connecting said gear to said mounting means for moving said device and for disconnecting said gear from its said operative connection with said mounting means whereby said device may be moved independently of said gear for movement to either of said positions, mechanism operatively connected to said gear for turning the latter intermittently, and means included in said mechanism for preventing said gear from turning between successive turning movements thereof by said mechanism.

15. Apparatusof the character described, comprising a device having a material-supply passage, means mounting said device for movement from one position to another, means including a gear for moving said mounting means, means for operatively connecting said gear to said mounting means for moving said device and for disconnecting said gear from its said operative connection with said mounting means whereby said device may be moved independently of said gear for movement to either of said positions, mechanism operatively connected to said gear for turning the latter intermittently, and means included in said mechanism for preventing said gear from turning between successive turning movements thereof by said mechanism, said latter means comprising a movable member having an edge extending in the direction of movement thereof and having a recess open at said edge, a gear member carried by said movable member at said recess, and a rotary gear mechanism having ag ear in mesh with said first mentioned gear and positioned to mesh with said gear member and to be turned by the latter only at a predetermined point in the move-. ment of said movable member, said 'gear mechanism having a second gear in fixed relation to said other gear thereof and having a smaller number of teeth than said other gear, said second gear having two teeth thereof in relatively movable contact with said edge whereby said two gears of said gear mechanism and said first mentioned gear are prevented from turning except when one of said two teeth is at said recess.

16. Apparatus of the character described, comprising a device having a material-supply passage and mounted for movement from one position to another position, means including a gear for moving said device, mechanism operatively connected to saidgear for turning the latter intermittently, and means included in said mechanism for preventing said gear from turning between successive turning movements thereof by said mechanism, said preventing means including a movable member having an edge extending in the direction of movement thereof and having a recess open at said edge, and a gear device engaged with said first mentioned gear and having two teeth thereof in relatively movable contact with said edge whereby said gear device is prevented from turning except when one of said two teeth is at said recess.

17 Appartaus of the character described, comprising a device having a material-supply passage, and mounted for movement from one position to another position, means for moving said device including a member mounted for movement, mechanism operatively connected to said member for moving the latter intermittently, and means included in said mechanism for preventing said member'from moving between successive movements thereof by said mechanism, said preventing means including an additional movable member having an edge extending in the direction of movement thereof and having a recess open at said edge, and a gear device interengaged between said members and having two teeth thereof in relatively movable contact with said edge whereby said gear device is prevented from turning except when one of said two teeth is at said recess.

18. Apparatus of the character described, comprising a receptacle rack mounted for movement, a device having a material-supply passage and mounted for movement from one position to another position relative to said rack, a gear unit mounted for rotation and for movement longitudinally of its axis from one position to another position, means for operatively connecting said rack releasably to said gear unit in one of said positions thereof for actuation by said gear unit, power-operated means releasably connected to said gear unit for turning the same in said one position thereof, and indexing means including a gear in mesh with a gear of said unit for turning said unit when the latter is disconnected from said power-operated means, said indexing gear being in mesh with said gear of said gear unit in both of said positions thereof whereby said indexing means is actuated by said gear unit when the latter is connected to said poweroperated means, a gear operatively connected to said device for turning the latter from said one position thereof to said other position thereof,

and means for turning said last mentioned gear and for preventing the same from turning between successive movements thereof, said last mentioned means comprising a movable member operatively connected to said indexing gear for movement in response to the rotation of said first mentioned gear unit, said movable member having an edge extending in the direction of movement thereof and having a recess open at said edge, a gear member carried by said movable member at said recess, and a rotary gear mechanism having a gear in mesh with the gear operatively connected to said device and positioned to mesh with said gear member and to be turned by the latter only at a predetermined point in the movement of said movable member, said gear mechanism having a second gear in fixed relation to said other gear thereof and having a smaller number of teeth than said other gear, said second gear having two teeth thereof in relatively movable contact with. said edge whereby said two gears of said gear mechanism and the gear operatively connected to said device are prevented from turning except when one of said two teeth is at said recess.

19. Apparatus of the character described, comprising a material-supply device mounted for turning movement from one position to another position, a gear operatively connected to said device for turning the latter from said one position to said other position, and means for turning said gear and for preventing the same from turning between successive movements thereof, said means comprising a movable mem ber having an edge extending in the direction of movement thereof and having a recess open at said edge, a gear member carried by said movable member at said recess, and a rotary gear mechanism having a gear in mesh with said first mentioned gear and positioned to mesh with said gear member and to be turned by the latter only at a predetermined point in the movement of said movable member, said gear mechanism having a second gear in fixed relation to said other gear thereof and having a smaller number of teeth than said other gear, said second gear having two teeth thereof in relatively movable contact with said edge whereby said two gears of said gear mechanism and said first mentioned gear are prevented from turning except when one of said two teeth is at said recess.

GEORGE GORHAM.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,767,620 Seeger June 24, 1930 2,290,626 Bosomworth July 21, 1942 2,418,701 Davis n Apr. 8, 1947 2,540,224 Vasselli Feb. 6, 1951 FOREIGN PATENTS Number Country Date 617,253 Great Britain Feb. 3, 1949 757,832 France Oct. 16, 1933 

